Assigkbtob to the teteb



C. K. TETER.

VAPOR WARMER.

APPLICATION FILED SEPT- 9. 1912.

Patented Nov. 211, 11922.

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Qizarles K T52?? Patented Nov. ill, i922.

CHARLES K. TETER, OF CLEVELAND, OHIO, ASSIGNOB TO TETER INIANUFACTURING COMPANY, OF CLEVELAND, OLE-10, A CORPORATION OF OHIO.

VAPOR IVABMER.

Application filed September 9, 1312.

To all whom it may concern.

Be it known that CI-IARLns K. Tnrnn, citi zen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, has invented certain new and useful Improvements in Vapor /Varmers, of which the following is a specification.

My invention relates to improvements in vapor warmers for anzesthetizing gases, and has for its primary object, the provision of means for administering volumes of nitrous oxide, and oxygen of uniform mixture, and at the desired temperature.

As is well known, nitrous oxide is commonly administered from flasks containing the gas in liquefied form, which upon expanding is chilled far below the point at which it may be administered. This is equally true of other aneethetizing agents, as well.

In accordance with modern practice, nitrous oxide is administered with varying percentages of oxygen, and to secure the best results, these gases should be evenly and thoroughly mixed. A. common mixingchamber ordinarily is resorted to, but I have discovered that the mixture of the gases may be made uniform, if they are circulated and intermingled during the heating operation.

My improved heater is designed to effect such mixture, and in lieu of the ordinary heating coil, 1 have provided a substantially convoluted series of pipes in parallel relation, through which the gases are forced or drawn. These pipes preferably are heated within a water-bath, and extending from top to bottom thereof, as they do, said pipes serve to heat the gases, and thoroughly mix them while passing through comparatively short lengths or sections of unobstructed passages. This latter feature, of course, adapts the heater for use in connection with relatively large volumes of gases, while maintaining a compact and convenient form for the device. Further details of the embodiment of my invention, may be more readily explained in connection with the accompanying drawings, wherein Fig. I, is a view in side elevation of the heater embodying my invention.

Fig. II, is a vertical sectional view thereof.

Fig. 111, is a perspective view of t e as Serial No. 718,387.

sembled unit or series of heating pipes em ployed therein, and

Fig. TV, is a cross sectional view of the heater on line TV-JV.

Fig. V, shows an electric heating-device. Throughout the several figures of the drawings, T have employed the same character of reference to indicate similar parts.

A cylindrical casing a is provided with tapped and threaded connections 6, c, which are adapted to be connected with any suitable apparatus for supplying and administering nitrous oxide, or other anaesthetic. Below the casing a removable wire-gauze covered lamp-chamber d is attached by a bayonet lock 6. The said chamber is equipped with a spirit-lamp f, to which access may be made by opening the hinged door 9.

The top of the heating chamber is provided with an opening it, closed by the screw cap 2', whereby the interior of the casing may be filled with water, while a cock j permits the water to be withdrawn.

l'nteriorly of said casing, there is provided my novel heating unit, comprisin series of vertically positioned pipes c united from end to end by means of rectangular elbows Z. The vapor warmer is adapted to be connected in the vapor line of any suitable administering apparatus, such as that shown in my Patent No. 883,987, April 7. 1908, by means of the oppositely positioned connections 77, 0. Thus the gases entering from the mixing chamber at one side of the heater will be directed down and up alternately, through the series of some six vertical pipes, as shown, and their connecting rectangular elbows. The latter, while affording abrupt turns for the passage of the gases, present spaces or pockets to insure interior eddy currents for effecting a thorough and even mixture thereof, during their course through the heating pipes. It will be observed that the convoluted conduit and pipes 70 are of relatively large diameter to afford the maximum radiation, and are capable of being completely immersed by the body of water within the heating chamber. The chamber is of such capacity that any fluctuation of the interior temperature of said conduit and contained gases in minimized. In consequence, the mixture of gases in the proportion required is delivered at the exit of the heater in uniform condition, and at the temperature desired.

When inflammable vapors, from such aneesthetics as ether or chloroform are to be which is adapted to be removably attached at the bayonet lock 0. A rheostat' may be connected with the heating coil of said heater for the purpose of controlling and maintaining the desired temperature. Of course, this device entirely obviates any danger arising from inflammable anaesthetics.

It will be recognized that the vaporizing of ether or chloroform in quantities sufficient to produce complete anaesthesia, will further chill the initially cold nitrous oxide mixture, In order to equalize the heating effect upon the gases and vapors, the pipes of the heating chamber are immersed in hot water. However, a reduction or stoppage of administering the volatile, vaporous anaesthetics will cause undue heating of the gaseous mixture unless the heating unitbe immediately controlled, or removed from the device, Such removal may be instantly accomplished by detaching the bayonet-locking means and withdrawing the safety heating unit temporarily or permanently, as desired.

Having now described the preferred embodiment of my i vention, I claim as new and desire to secure by Letters Patent, the

following 2-- 1. In a vapor warmer, the combination with a heating-chamber, of means for supplying heat thereto, a series of substantially parallel pipes. positioned therein,

through which the vapors or gases are designed to pass, and rectangular connections uniting the said pipes encbto-end, substan tially as set forth.

2. In a warming and mixingdevice for anaesthetizing gases or vapors, the combination with a fluid-containing heatingchamber, of means for supplying heat thereto, a series of vertical pipes within the chamber through which the gases or vapors are adapted to pass, and'rectangular elbows uniting said pipes end-to-end in a continuous series, whereby the gases are thoroughly mixed during the heating thereof, substantially as set forth.

3. In a warming and mixing device for anaesthetizing vapors, the combinationwith a heating chamber adapted to contain a fluid-medium, of a heating-member positioned beneath the same, a series of vertical pipes within the chamber, provided with aligned external openings having downward connections intermediate of said chamber, and rectangular connections uniting said pipes end-to-end in a continuous series, whereby the vapors will be mixed during the heating thereof, substantially as set forth.

4:, In a vapor warmer and mixer, the combination with a heating chamber, of external means for supplying heat thereto, a series of vertically arranged pipes positioned therein through which the vapors or gases are designed to be passed in series, expansive joints uniting the lengths of pipe at their ends to facilitate the mixture of the vapors, and inlet and outlet members arranged in substantial alineme-nt to connect with said series of pipes and with a supply line, substantially as set forth.

In testimony whereof I do now affix my signature in presence of two Witnesses.

CHARLES K. TETER. Witnesses:

H. W. BELL,

ALBERT LYNN LAWRENCE. 

